pvlib.bifacial.utils.vf_row_sky_2d#

pvlib.bifacial.utils.vf_row_sky_2d(surface_tilt, gcr, x)[source]#

Calculate the view factor to the sky from a point x on a row surface.

Assumes a PV system of infinitely long rows with uniform pitch on horizontal ground. The view to the sky is restricted by the row’s surface tilt and the top of the adjacent row.

Parameters:

surface_tilt (numeric) – Surface tilt angle in degrees from horizontal, e.g., surface facing up = 0, surface facing horizon = 90. [degree]
gcr (numeric) – Ratio of the row slant length to the row spacing (pitch). [unitless]
x (numeric) – Position on the row’s slant length, as a fraction of the slant length. x=0 corresponds to the bottom of the row. [unitless]

Returns:

vf (numeric) – Fraction of the sky dome visible from the point x. [unitless]